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a) The fuel storage yard is separated from the main plant by a swing bridge (swinging in a horizontal plane). The motor driving the bridge requires replacement necessitating an analysis of torque requirements. The bridge must swing through an angle of 90o in 120s. The bridge accelerates uniformly for 40s then moves at a constant velocity, decelerating uniformly to rest in the final 20s.The rotating components of the bridge have an equivalent moment of inertia of 103 kgm2 and feel a constant resisting torque of 300Nm. Find the torque required for the three stages of motion.
b) A problem has arisen in the goods yard where a large container is required to be pulled along a makeshift horizontal slipway by a rope wound around a winding drum. See below. The container has a mass of 1.5 tonne and is pulled along the horizontal slipway at an acceleration of 0.9m/s2. The resistance to motion of the container is equivalent to a co-efficient of friction of 0.6. The winding drum has a mass of 0.5tonne, outside diameter of 1m and radius of gyration of 0.3m. The drum has a resistance couple of 200Nm acting on it. Find the torque required by the motor of the winding drum.
In the assessment of a buffers performance, a railway carriage of mass 6 tonne is allowed to roll freely down an incline of 1 in 20 (sine) for a distance of 50m into a horizontal yard. At the end of the yard it is brought to rest by a pair of parallel buffer springs. The stiffness of each spring is 30kNim and the initial resisting force in each spring before impact is 4.5kN. Using an energy method calculate the maximum compression of the springs.
a coin placed 30.8 cm from the center of a rotating horizontal turntable slips when its speed is 51.2 cms.a what force
a two stage compressor with intercooling between the stages is used to compress air from 1 bar and 150c to 9bar in a
Determine the resulting change
What is the rate of heat removal per unit width of the fin? Generate a plot of the heat removal rate per unit width of the fin for motorcycle speeds ranging from 10 to 100 km/h.
Determine the elastic modulus (E), and indicate its value and show how you determined it on the appropriate curve? Explain how cold working (plastically deforming) a metal increases its strength?
the piston diameter is dp 3 mm and the piston position is initially s1 5 cm from the bottom of the piston. at this
compressive centric forces of 30 kips are applied at both ends of the assembly shown by means of rigid end plates.
the flow rate of air ar standard conditions in a flat duct is to be determined by installing pressure taps across a
A commercial refrigerator with refrigerant- 134a as the working fluid is used to keep the refrigerated space at 235°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/ s and leaves at 26°C.
The horizontal pump in Fig discharges 20°C water at 57 m3/h. Neglecting losses, what power in kW is delivered to the water by the pump?
A trapezoidal channel with a bottom width of 4.00 feet and side slopes of 2 horizontal to 1 vertical conveys a discharge of 300 cfs. If the depth of flow is 2.25 feet, what is the Froude number? Is the flow subcritical or supercritical?
the planar motion of a 0.5 kg particle is defined by the equations r6t2m and thetat rad where t is in seconds.
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